linux-kernel - Re: [PATCH] ftracetest: Replace usleep with sleep 0.000001

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Message-ID: <20141220170725.776363ac@gandalf.local.home>
Date:	Sat, 20 Dec 2014 17:07:25 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Pavel Machek <pavel@....cz>
Cc:	Michael Ellerman <mpe@...erman.id.au>, namhyung@...nel.org,
	masami.hiramatsu.pt@...achi.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ftracetest: Replace usleep with sleep 0.000001

On Sat, 20 Dec 2014 21:42:13 +0100
Pavel Machek <pavel@....cz> wrote:

> On Wed 2014-12-10 15:38:27, Michael Ellerman wrote:
> > usleep is a Fedoraism, it's not generally available on Debian based
> > systems AFAICS.
> > 
> > GNU sleep accepts a floating point argument, so use that instead.
> > 
> > Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
> 
> Could ftrace user interface be enhanced not to need random delays?
> 

Not sure what you are talking about. These "random delays" are not for
the interface, but instead to force some events to happen and to make
sure they did.

As the subject states, this is for "ftracetest" which is the selftests
for ftrace.

The usleep is basically a "do something to trigger events", and we
don't want to wait long in doing it.

-- Steve
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